Frame Formats Supported
Page 29-13

Frame Formats Supported

Frames coming in from the Frame Relay network are not translated, but they are manipulated
to be compatible for transport over the switch’s VBUS. Incoming frames must contain RFC 1490
headers. The following standard 1490 frame types are supported:
• BPDU
• Ethernet 802.3
• Token Ring 802.5 (see Note below)
• FDDI (see Note below)
• IP Routed
• ARP/InARP Routed
• IPX Routed
• Compressed (which decompresses to one of the above supported formats)
Note
Source Routing is not supported on Token Ring and
FDDI frames.
All other frames types from the network are discarded at the physical port level.
Frames coming from the switch to the Frame Relay network are optionally translated if they
are a non-Ethernet frame (e.g., FDDI and Token Ring) for a Bridged VLAN. In this case, the
frame is translated to an Ethernet frame before it is sent to the Frame Relay interface. Frames
from non-Ethernet interfaces can also be sent as is without translation. This translation, which
is called Default Bridging Mode, can be configured at the service or port level. In addition,
BPDU and Routed frames (IP, ARP, InARP, IPX) are accepted.